Current File : //usr/lib/calibre/calibre/ebooks/metadata/book/serialize.py
#!/usr/bin/env python3
# License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
from calibre.constants import preferred_encoding
from calibre.ebooks.metadata.book import SERIALIZABLE_FIELDS
from calibre.ebooks.metadata.book.base import Metadata
from calibre.utils.imghdr import what
from polyglot.builtins import iteritems
from polyglot.binary import as_base64_unicode
def ensure_unicode(obj, enc=preferred_encoding):
if isinstance(obj, str):
return obj
if isinstance(obj, bytes):
return obj.decode(enc, 'replace')
if isinstance(obj, (list, tuple)):
return [ensure_unicode(x) for x in obj]
if isinstance(obj, dict):
return {ensure_unicode(k): ensure_unicode(v) for k, v in iteritems(obj)}
return obj
def serialize_cover(path):
with lopen(path, 'rb') as f:
cd = f.read()
return what(None, cd), cd
def read_cover(mi):
if mi.cover_data and mi.cover_data[1]:
return mi
if mi.cover:
try:
mi.cover_data = serialize_cover(mi.cover)
except OSError:
pass
return mi
def metadata_as_dict(mi, encode_cover_data=False):
if hasattr(mi, 'to_book_metadata'):
mi = mi.to_book_metadata()
ans = {}
for field in SERIALIZABLE_FIELDS:
if field != 'cover' and not mi.is_null(field):
val = getattr(mi, field)
ans[field] = ensure_unicode(val)
if mi.cover_data and mi.cover_data[1]:
if encode_cover_data:
ans['cover_data'] = [mi.cover_data[0], as_base64_unicode(mi.cover_data[1])]
else:
ans['cover_data'] = mi.cover_data
um = mi.get_all_user_metadata(False)
if um:
ans['user_metadata'] = um
return ans
def metadata_from_dict(src):
ans = Metadata('Unknown')
for key, value in iteritems(src):
if key == 'user_metadata':
ans.set_all_user_metadata(value)
else:
setattr(ans, key, value)
return ans
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